如何知道远程服务器是否与远程控制Java代码断开连接
我有这个代码,如果从服务器窗口断开连接,我需要在标签中显示“disconnected”。我的问题是,我不知道如何检测是否断开了连接。我想检测连接状态,即使没有连接或另一端没有触发器如何知道远程服务器是否与远程控制Java代码断开连接,java,android,swing,remote-desktop,remote-server,Java,Android,Swing,Remote Desktop,Remote Server,我有这个代码,如果从服务器窗口断开连接,我需要在标签中显示“disconnected”。我的问题是,我不知道如何检测是否断开了连接。我想检测连接状态,即使没有连接或另一端没有触发器 // Copyright 2012 // Android Remote Desktop Server Ver. 1.0 import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.net.*; import jav
// Copyright 2012
// Android Remote Desktop Server Ver. 1.0
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.util.Random;
public class ServerWindow implements ActionListener{
private RemoteDataServer server;
private Thread sThread; //server thread
private static final int WINDOW_HEIGHT = 200;
private static final int WINDOW_WIDTH = 350;
private String ipAddress;
private JFrame window = new JFrame("Remote Control for Android");
private JLabel addressLabel = new JLabel("");
private JLabel portLabel = new JLabel("Android Remote Control Port: ");
private JTextArea[] buffers = new JTextArea[3];
private JTextField portTxt = new JTextField(5);
private JLabel serverMessages = new JLabel("Not Connected");
private JButton connectButton = new JButton("Start Server");
private JButton disconnectButton = new JButton("Stop Server");
public boolean connected = false;
public ServerWindow(){
server = new RemoteDataServer();
window.setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
connectButton.addActionListener(this);
disconnectButton.addActionListener(this);
Container c = window.getContentPane();
c.setLayout(new FlowLayout());
try{
InetAddress ip = InetAddress.getLocalHost();
ipAddress = ip.getHostAddress();
addressLabel.setText("Android Remote Control Server IP Address: "+ipAddress);
}
catch(Exception e){addressLabel.setText("IP Address Could Not be Resolved");}
int x;
for(x = 0; x < 3; x++){
buffers[x] = new JTextArea("", 1, 30);
buffers[x].setEditable(false);
buffers[x].setBackground(window.getBackground());
}
portTxt.setEditable(false);
Random portRandom = new Random();
for (int i = 0; i < 10; i++) {
int port = portRandom.nextInt(4998) + 1;
int portNum = 5000+port;
String portString = Integer.toString(portNum);
portTxt.setText(portString);
}
c.add(addressLabel);
c.add(buffers[0]);
c.add(portLabel);
//portTxt.setText("5444");
c.add(portTxt);
c.add(buffers[1]);
c.add(connectButton);
c.add(disconnectButton);
c.add(buffers[2]);
c.add(serverMessages);
window.setLocationRelativeTo(null);
window.setVisible(true);
window.setResizable(false);
}
public void actionPerformed(ActionEvent e){
Object src = e.getSource();
if(src instanceof JButton){
if((JButton)src == connectButton){
int port = Integer.parseInt(portTxt.getText());
runServer(port);
}
else if((JButton)src == disconnectButton){
closeServer();
}
}
}
public void runServer(int port){
if(port <= 9999){
server.setPort(port);
sThread = new Thread(server);
sThread.start();
}
else{
serverMessages.setText("The port Number must be less than 10000");
}
}
public void closeServer(){
serverMessages.setText("Disconnected");
server.shutdown();
connectButton.setEnabled(true);
}
public static void main(String[] args){
new ServerWindow();
}
public class RemoteDataServer implements Runnable{
int PORT;
private DatagramSocket server;
private byte[] buf;
private DatagramPacket dgp;
private String message;
private AutoBot bot;
public RemoteDataServer(int port){
PORT = port;
buf = new byte[1000];
dgp = new DatagramPacket(buf, buf.length);
bot = new AutoBot();
serverMessages.setText("Not Connected");
}
public RemoteDataServer(){
buf = new byte[1000];
dgp = new DatagramPacket(buf, buf.length);
bot = new AutoBot();
serverMessages.setText("Not Connected");
}
public String getIpAddress(){
String returnStr;
try{
InetAddress ip = InetAddress.getLocalHost();
returnStr = ip.getCanonicalHostName();
}
catch(Exception e){ returnStr = new String("Could Not be Resolve Ip Address");}
return returnStr;
}
public void setPort(int port){
PORT = port;
}
public void shutdown(){
try{server.close();
serverMessages.setText("Disconnected");}
catch(Exception e){}
}
public void run(){
//boolean connected = false;
try {InetAddress ip = InetAddress.getLocalHost();
serverMessages.setText("Waiting for connection on " + ip.getCanonicalHostName());
server = new DatagramSocket(PORT, ip);
connected = true;
connectButton.setEnabled(false);
}
catch(BindException e){ serverMessages.setText("Port "+PORT+" is already in use. Use a different Port"); }
catch(Exception e){serverMessages.setText("Unable to connect");}
while(connected){
//Runtime.getRuntime().exit(0);
// get message from sender
try{ server.receive(dgp);
// translate and use the message to automate the desktop
message = new String(dgp.getData(), 0, dgp.getLength());
if (message.equals("Connectivity")){
//send response to confirm connectivity
serverMessages.setText("Trying to Connect");
server.send(dgp); //echo the message back
}else if(message.equals("Connected")){
server.send(dgp); //echo the message back
}else if(message.equals("Close")){
serverMessages.setText("Controller has Disconnected. Trying to reconnect."); //echo the message back
}else{
serverMessages.setText("Android Phone Connected to ARD Server");
bot.handleMessage(message);
server.receive(dgp);
}
}catch(Exception e){
serverMessages.setText("Disconnected");
connected = false;}
}
}
}
}
//版权所有2012
//Android远程桌面服务器版本。1
导入javax.swing.*;
导入java.awt.*;
导入java.awt.event.*;
导入java.net。*;
导入java.util.Random;
公共类ServerWindow实现ActionListener{
专用远程数据服务器;
私有线程sThread;//服务器线程
专用静态最终整数窗口的高度=200;
私有静态最终整数窗口_宽度=350;
私有字符串IP地址;
私有JFrame窗口=新JFrame(“Android远程控制”);
专用JLabel addressLabel=新JLabel(“”);
私有JLabel端口标签=新的JLabel(“Android远程控制端口:”);
私有JTextArea[]缓冲区=新的JTextArea[3];
私有JTextField portTxt=新的JTextField(5);
专用JLabel服务器消息=新JLabel(“未连接”);
私有JButton connectButton=新JButton(“启动服务器”);
私有JButton disconnectButton=新JButton(“停止服务器”);
公共布尔连接=false;
公共服务器窗口(){
服务器=新的RemoteDataServer();
设置大小(窗宽、窗高);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
connectButton.addActionListener(此);
disconnectButton.addActionListener(此);
容器c=window.getContentPane();
c、 setLayout(新的FlowLayout());
试一试{
InetAddress ip=InetAddress.getLocalHost();
ipAddress=ip.getHostAddress();
addressLabel.setText(“Android远程控制服务器IP地址:+ipAddress”);
}
catch(异常e){addressLabel.setText(“无法解析IP地址”);}
int x;
对于(x=0;x<3;x++){
缓冲区[x]=新的JTextArea(“,1,30);
缓冲区[x].setEditable(假);
缓冲区[x].setBackground(window.getBackground());
}
portTxt.setEditable(false);
Random portRandom=新的Random();
对于(int i=0;i<10;i++){
int port=portRandom.nextInt(4998)+1;
int-portNum=5000+端口;
字符串portString=Integer.toString(portNum);
portTxt.setText(portString);
}
c、 添加(地址标签);
c、 添加(缓冲区[0]);
c、 添加(端口标签);
//portTxt.setText(“5444”);
c、 添加(portTxt);
c、 添加(缓冲区[1]);
c、 添加(连接按钮);
c、 添加(断开按钮);
c、 添加(缓冲区[2]);
c、 添加(服务器消息);
window.setLocationRelativeTo(空);
window.setVisible(true);
window.setresizeable(false);
}
已执行的公共无效操作(操作事件e){
对象src=e.getSource();
if(JButton的src instanceof){
if((JButton)src==connectButton){
int port=Integer.parseInt(portTxt.getText());
运行服务器(端口);
}
else if((JButton)src==断开按钮){
closeServer();
}
}
}
公共void运行服务器(int端口){
如果(端口由于您使用UDP,因此两个对等方之间没有“真实”连接,则可能需要执行来自客户端的某种定期保持活动的请求。
如果没有收到关于keep alive的响应,则表示您已断开连接。您能否给出一些代码或示例,因为我是Android编程的初学者。谢谢